SULISTIONO , TEGUH, et al. “THE EFFECT OF PLANT SPACING AND NPK FERTILIZER ON THE GROWTH AND YIELD OF SORGHUM NUMBU VARIETY”. TPM – Testing, Psychometrics, Methodology in Applied Psychology, vol. 32, no. 2- June, June 2025, pp. 100-7, https://tpmap.org/submission/index.php/tpm/article/view/387.